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Eastaugh, Nicholas (2004), p. 331
Pedrola, Antoni (1998), p. 93
Asensio Fuentes, Antonio (1982), p. 29
Matteini, Mauro; Moles, Arcangelo (2001), p. 74
Calvo, Ana (2003), p. 23
Roquero, Ana; Córdoba, Carmen (1981), pp. 70-72
Castroviejo, Santiago (1982), pp. 98-99
Perego, François (2005), pp. 648-649